运用平方差公式计算(2x-1)(2x+1) (1/2a-2b)(1/2a+2b)(5m+3n)(3n-5m)(-x+y)(-x-y_数学解答

运用平方差公式计算
(2x-1)(2x+1)
(1/2a-2b)(1/2a+2b)
(5m+3n)(3n-5m)
(-x+y)(-x-y)
101×99
9.8×10.2

人气：270 ℃　时间：2020-03-20 09:08:54

解答

(2x-1)(2x+1) =(2x)²-1=4x²-1(1/2a-2b)(1/2a+2b)=(1/2a)²-(2b)²=1/4a²-4b²(5m+3n)(3n-5m)=(3n)²-(5m)²=9n²-25m²(-x+y)(-x-y)=(-x)²-y²=x²-y²...